holocaust
The word "holocaust" (little "h") means, literally, all burnt up. It is a Greek word, originally, and referred specifically to burnt offerings (of animals, like livestock or barnyard fowl), sacrifices to the gods.
Some Jews, and others, have objected to the use of the word "holocaust" to refer to what they call instead, "the Nazi genocide," or the "Shoah." The implication that the Jews who perished in concentration camps were somehow sacrificed to appease God seems to many to be wrong-headed, and theologically misconstrued.